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AEM Cold Air Intake Gunmetal Grey - Subaru WRX/STi 2004-2007
AEM Cold Air Intake Gunmetal Grey - Subaru WRX/STi 2004-2007
AEM Cold Air Intake Gunmetal Grey - Subaru WRX/STi 2004-2007
AEM Cold Air Intake Gunmetal Grey - Subaru WRX/STi 2004-2007
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User Media for: AEM Cold Air Intake Gunmetal Grey - Subaru WRX/STi 2004-2007

AEM Cold Air Intake Gunmetal Grey

Subaru WRX/STi 2004-2007

Read 4 Reviews | 4 Q&As
Part # 21-477C
msrp: $319.99

In stock!
Ships within 24 hours

Features & Product Details

RallySport Direct is proud to provide you with another quality performance intake system brought to you by AEM.

On this page, you are looking at the AEM Cold Air Intake System designed specifically for your application to replace the factory restrictive intake system to increase both power and performance. This is a complete kit that replaces your factory air filter and air intake housing and has been dyno-proven to produce more power and torque.

Here are the details:

  • Tuned and dyno-tested to improve acceleration and engine sound
  • Low restriction aluminum intake pipe
  • Intake pipe will come powder-coated a gunmetal color
  • Air filter can last up to 100,000 miles before cleaning is required
  • Air filter is washable and reusable
  • Comes with the DryFlow filter option
  • Increased horsepower
  • Improved throttle response
  • Improved torque
  • Reduced turbo lag
  • Increased intake sound
  • Includes new clamps
  • Note that a tune is required to utilize the maximum performance from this intake
  • Specifications

    Brand: AEM
    Carb Exempt: Yes
    Carb E.O. Number: D-670-6
    Filter Color: Grey
    Filter Element Type: Dry
    Filter Material: Cotton
    Filter Reusable: Yes
    Includes Airbox: No
    Piping Color: Grey
    Piping Material: Aluminum
    Tuning Required: No
    Mfgr. Warranty: Limited Lifetime Warranty
    Condition: New Product
    Return Policy:
    WARNING: Cancer and Reproductive Harm -



    4 Reviews
    5 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
    AEM Cold Air Intake Gunmetal Grey ( Part Number: 21-477C)
    Good stuff 2 years ago
    5out of 5stars

    Can hear the turbo more! Easy install. Good quality parts! Would buy again!
    Was this review helpful?
    6 of 6 people found the following review helpful
    Another quality product from AEM 3 years ago
    5out of 5stars

    I decided to pick up this intake for 2006 WRX, as I previously had the Perrin short-ram and intake temps were just too high for my liking, and it would very quickly become heatsoaked when not moving. What a huge difference. After letting it idle in my driveway for almost 20 minutes, my intake temps never got above 4 or 5 degrees above ambient. Install was pretty straightforward. I decided to remove my fender to make everything easier to access. A little tedious, but overall, very simple. Now, even though the description states a tune is not required, you definitely need to tune for any aftermarket intake for MAF scaling and A/F ratio purposes. I know a lot of people out there say that a CAI doesn't matter because the air is heated up due to the compression that takes place in the turbo, and is then cooled through an intercooler. While this is true, your IAT (intake air temperature) sensor is located within the MAF sensor, so, if your IATs are very high, it won't matter how efficient your intercooler is, your ECU will still pull timing when the temperature reaches 125+ degrees. So, for the purposes of ECU calibration, yes, a CAI intake definitely makes a huge difference. You won't ever pull timing with this thing. Do yourself a favor and learn from my mistakes, don't buy a short-ram intake, and pick up one of these. You'll be glad you did. I also purchased the AEM DryFlow filter cover to protect against dirt and water. So, if you're concerned about the location of the filter making it vulnerable to dirt and moisture, buy one of those covers and you'll have nothing to worry about.
    Was this review helpful?
    so far so good 6 years ago
    5out of 5stars

    good looking pipe with a gigantic filter attached to it. Does not fit with AVO's extended one piece silicone inlet. I had to modify the pipe by removing five inches of pipe post MAF location. Worked out nicely in the end. Still in break-in tune mode., however the MAF has been scaled in nicely and there appears not to be any abnormal turbulence created by the pipe modification.
    Was this review helpful?
    Also fits 2006-2008 Forester XT 8 years ago
    5out of 5stars

    I was looking for another intake that would fit my '06 FXT Limited because the Cobb SF is a bit too noisy for my tastes. This one fit just fine without any modifications or tweaks.
    Was this review helpful?


    • Q: Compatible with FMIC  atriplis997735 years ago

      Do you guys happen to know if this will fit with the Perrin FMIC? Curious if the pipes will hit on an 06 Sti. Thanks
      • 0 of 0 people found the following answer helpful

        A:  As of right now we have not tested the products together to determine compatibility. We will not be able to guarantee fitment.

        Trevor C. @ RallySport Direct 5 years ago  
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    • Q: aem cai  O6hawkeye6 years ago

      Will this aem cai fit a perrin turbo inlet
      • 0 of 0 people found the following answer helpful

        A:  This intake will work with a perrin turbo inlet. Sometimes a coupler is needed for perfect fitment.

        Trevor C. @ RallySport Direct 6 years ago  
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